Charging documents say Garrett was boarding a MetroLink train Thursday in Wellston when a security guard asked to see his ticket. Garrett allegedly pulled out a gun and shot the guard in the shoulder. The guard's injuries are not considered life-threatening.

St. Louis County Police say two county officers were riding the train and heard the shot. Officers shot Garrett in the buttocks. Police say a loaded semi-automatic pistol was found in Garrett's pocket.